<!doctype html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>hello_react</title>
    </head>
    <body>
        <div id="test1"></div>

        <!-- 引入 react 核心库 -->
        <script src="./js/react.development.js" type="text/javascript"></script>
        <!-- React 对象 -->
        <script src="./js/react-dom.development.js" type="text/javascript"></script>
        <!-- ReactDOM 对象 -->
        <script src="./js/babel.min.js" type="text/javascript"></script>
        <!-- babel -->
        <script src="./js/prop-types.js" type="text/javascript"></script>
        <!-- PropTypes -->

        <script type="text/babel">
            class Demo extends React.Component {
                // 展示左侧输入框的数据
                showData = () => {
                    const { input1 } = this
                    alert(input1.value)
                }
                showData2 = () => {
                    const { input2 } = this
                    alert(input2.value)
                }
                // 回调形式的ref的入参是ref的整个dom
                render() {
                    return (
                        <div>
                            <input ref={dom => (this.input1 = dom)} type="text" placeholder="点击按钮提示数据" />
                            <button onClick={this.showData}>点我提示左侧的数据</button>
                            <input
                                ref={dom => {
                                    this.input2 = dom
                                }}
                                onBlur={this.showData2}
                                type="text"
                                placeholder="失去提示数据"
                            />
                        </div>
                    )
                }
            }
            ReactDOM.render(<Demo />, document.querySelector('#test1'))
        </script>
    </body>
</html>
